He is very unintelligent but wants all to equate his business achievements with intelligence. Obama was a university professor, learned, polished and Trump constantly want himself to be seen as a more intellectually superior person.
Of course, majority of his audience are the lowest cadres of Americans - non-degreed-high-school-, university-drop outs who went into employment in the mines, car industry, walmarts, supermarkets etc and achieved their American dream of home, car, family, etc which they think make them middle class or more. But they are not people with any developed analytical reasoning.
Undoing what a perceived more intelligent predecessor supervised in governance appears to be the way to prove to his IQ base members that he is strong and clever.
Sad for world and the reputation that America has built over several decades around the world.